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<span class="comment">// Copyright 2014-2015 The Rust Project Developers. See the COPYRIGHT</span>
<span class="comment">// file at the top-level directory of this distribution and at</span>
<span class="comment">// http://rust-lang.org/COPYRIGHT.</span>
<span class="comment">//</span>
<span class="comment">// Licensed under the Apache License, Version 2.0 &lt;LICENSE-APACHE or</span>
<span class="comment">// http://www.apache.org/licenses/LICENSE-2.0&gt; or the MIT license</span>
<span class="comment">// &lt;LICENSE-MIT or http://opensource.org/licenses/MIT&gt;, at your</span>
<span class="comment">// option. This file may not be copied, modified, or distributed</span>
<span class="comment">// except according to those terms.</span>

<span class="kw">use</span> <span class="ident">re_trait</span>::{<span class="ident">RegularExpression</span>, <span class="ident">Slot</span>};

<span class="doccomment">/// Plugin is the compiler plugin&#39;s data structure. It declare some static</span>
<span class="doccomment">/// data (like capture groups and the original regex string), but defines its</span>
<span class="doccomment">/// matching engine as a simple function.</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Plugin</span> {
    <span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
    <span class="kw">pub</span> <span class="ident">original</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static</span> <span class="ident">str</span>,
    <span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
    <span class="kw">pub</span> <span class="ident">names</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static</span> <span class="kw-2">&amp;</span><span class="lifetime">&#39;static</span> [<span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="lifetime">&#39;static</span> <span class="ident">str</span><span class="op">&gt;</span>],
    <span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
    <span class="kw">pub</span> <span class="ident">groups</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static</span> <span class="kw-2">&amp;</span><span class="lifetime">&#39;static</span> [(<span class="kw-2">&amp;</span><span class="lifetime">&#39;static</span> <span class="ident">str</span>, <span class="ident">usize</span>)],
    <span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
    <span class="kw">pub</span> <span class="ident">prog</span>: <span class="kw">fn</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> [<span class="ident">Slot</span>], <span class="kw-2">&amp;</span><span class="ident">str</span>, <span class="ident">usize</span>) <span class="op">-&gt;</span> <span class="ident">bool</span>,
}

<span class="kw">impl</span> <span class="ident">Copy</span> <span class="kw">for</span> <span class="ident">Plugin</span> {}

<span class="kw">impl</span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">Plugin</span> {
    <span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">Plugin</span> {
        <span class="kw-2">*</span><span class="self">self</span>
    }
}

<span class="kw">impl</span> <span class="ident">RegularExpression</span> <span class="kw">for</span> <span class="ident">Plugin</span> {
    <span class="kw">type</span> <span class="ident">Text</span> <span class="op">=</span> <span class="ident">str</span>;

    <span class="kw">fn</span> <span class="ident">slots_len</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) <span class="op">-&gt;</span> <span class="ident">usize</span> {
        <span class="self">self</span>.<span class="ident">names</span>.<span class="ident">len</span>() <span class="op">*</span> <span class="number">2</span>
    }

    <span class="kw">fn</span> <span class="ident">next_after_empty</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">text</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>, <span class="ident">i</span>: <span class="ident">usize</span>) <span class="op">-&gt;</span> <span class="ident">usize</span> {
        <span class="kw">let</span> <span class="ident">b</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">text</span>.<span class="ident">as_bytes</span>().<span class="ident">get</span>(<span class="ident">i</span>) {
            <span class="prelude-val">None</span> <span class="op">=&gt;</span> <span class="kw">return</span> <span class="ident">text</span>.<span class="ident">len</span>() <span class="op">+</span> <span class="number">1</span>,
            <span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span><span class="ident">b</span>) <span class="op">=&gt;</span> <span class="ident">b</span>,
        };
        <span class="kw">let</span> <span class="ident">inc</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">b</span> <span class="op">&lt;=</span> <span class="number">0x7F</span> {
            <span class="number">1</span>
        } <span class="kw">else</span> <span class="kw">if</span> <span class="ident">b</span> <span class="op">&lt;=</span> <span class="number">0b110_11111</span> {
            <span class="number">2</span>
        } <span class="kw">else</span> <span class="kw">if</span> <span class="ident">b</span> <span class="op">&lt;=</span> <span class="number">0b1110_1111</span> {
            <span class="number">3</span>
        } <span class="kw">else</span> {
            <span class="number">4</span>
        };
        <span class="ident">i</span> <span class="op">+</span> <span class="ident">inc</span>
    }

    <span class="kw">fn</span> <span class="ident">shortest_match_at</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">text</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>, <span class="ident">start</span>: <span class="ident">usize</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">usize</span><span class="op">&gt;</span> {
        <span class="self">self</span>.<span class="ident">find_at</span>(<span class="ident">text</span>, <span class="ident">start</span>).<span class="ident">map</span>(<span class="op">|</span>(_, <span class="ident">e</span>)<span class="op">|</span> <span class="ident">e</span>)
    }

    <span class="kw">fn</span> <span class="ident">is_match_at</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">text</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>, <span class="ident">start</span>: <span class="ident">usize</span>) <span class="op">-&gt;</span> <span class="ident">bool</span> {
        (<span class="self">self</span>.<span class="ident">prog</span>)(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> [], <span class="ident">text</span>, <span class="ident">start</span>)
    }

    <span class="kw">fn</span> <span class="ident">find_at</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">text</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>, <span class="ident">start</span>: <span class="ident">usize</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span>(<span class="ident">usize</span>, <span class="ident">usize</span>)<span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">slots</span> <span class="op">=</span> [<span class="prelude-val">None</span>, <span class="prelude-val">None</span>];
        <span class="self">self</span>.<span class="ident">read_captures_at</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">slots</span>, <span class="ident">text</span>, <span class="ident">start</span>)
    }

    <span class="kw">fn</span> <span class="ident">read_captures_at</span><span class="op">&lt;</span><span class="lifetime">&#39;t</span><span class="op">&gt;</span>(
        <span class="kw-2">&amp;</span><span class="self">self</span>,
        <span class="ident">slots</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> [<span class="ident">Slot</span>],
        <span class="ident">text</span>: <span class="kw-2">&amp;</span><span class="lifetime">&#39;t</span> <span class="ident">str</span>,
        <span class="ident">start</span>: <span class="ident">usize</span>,
    ) <span class="op">-&gt;</span> <span class="prelude-ty">Option</span><span class="op">&lt;</span>(<span class="ident">usize</span>, <span class="ident">usize</span>)<span class="op">&gt;</span> {
        <span class="kw">for</span> <span class="ident">slot</span> <span class="kw">in</span> <span class="ident">slots</span>.<span class="ident">iter_mut</span>() {
            <span class="kw-2">*</span><span class="ident">slot</span> <span class="op">=</span> <span class="prelude-val">None</span>;
        }
        (<span class="self">self</span>.<span class="ident">prog</span>)(<span class="ident">slots</span>, <span class="ident">text</span>, <span class="ident">start</span>);
        <span class="kw">match</span> (<span class="ident">slots</span>[<span class="number">0</span>], <span class="ident">slots</span>[<span class="number">1</span>]) {
            (<span class="prelude-val">Some</span>(<span class="ident">s</span>), <span class="prelude-val">Some</span>(<span class="ident">e</span>)) <span class="op">=&gt;</span> <span class="prelude-val">Some</span>((<span class="ident">s</span>, <span class="ident">e</span>)),
            _ <span class="op">=&gt;</span> <span class="prelude-val">None</span>,
        }
    }
}
</pre>
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